Headphone



FIG. 1 is a front perspective view of a headphone;

FIG. 2 is a reduced right side view;

FIG. 3 is a reduced left side view;

FIG. 4 is a further reduced rear view;

FIG. 5 is a further reduced front view;

FIG. 6 is a reduced top view thereof; and,

FIG. 7 is a reduced bottom view.

The indicia in FIGS. 1-3 is shown in broken lines for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a headphone, as shown and described. 